Figure 4

The effect of ZnO NPs on biofilm formation represented by OD at 570/600 nm (y-axis) for the ATCC strain and six clinically isolated strains (PA1-PA6) at different concentrations of ZnO NPs range from 100 to 1000 µg/ml (x-axis) after 24-h incubation period. **** < 0.0001, ***0.0001, ** < 0.001, * < 0.01.